[Bug 39988] New: winepath -w wrong output with path longer 260

https://bugs.winehq.org/show_bug.cgi?id=39988

Bug ID: 39988
           Summary: winepath -w wrong output with path longer 260
           Product: Wine
           Version: 1.9.0
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

When the input $pathname is longer than 260 characters wine -w $pathname
1. truncates the converted output path at 260 characters
2. appends some garbage characters to it
3. reports no error and exits with status 0

I think fixing #3 as a minimum is important; at least exit 1, possibly print an
error message.

Fixing #2? Why is it printing garbage characters? Buffer overrun?

And please consider changing #1 by extending support to paths > 260 characters.
After all, if I convert the same path by hand and feed it to a Windows
application it has no problems dealing with it. So the 260-character limit of
winepath -w seems rather artificial to me.

I create long linux paths with
mkdir -p /tmp/aaa/bbb/ccc/ddd/eee/
touch /tmp/aaa/bbb/ccc/ddd/eee/$(dd if=/dev/zero count=1 bs=260 | tr '\000' a)
# which creates /tmp/aaa/bbb/ccc/ddd/eee/aaaaaaaa...

Thanks.

[Bug 39988] winepath -w wrong output with path longer 260

https://bugs.winehq.org/show_bug.cgi?id=39988

[e-mail] changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |[e-mail]

--- Comment #1 from [e-mail] ---
I was looking for wine source code with keyword MAX_PATH I did find lots of
hits, but I was unable to find the value. On the other hand I found maxpathlen
or something similar and it was limited to 256. Assuming that it's because of
some buffer overflow.

[Bug 39988] winepath -w wrong output with path longer 260

https://bugs.winehq.org/show_bug.cgi?id=39988

--- Comment #2 from [e-mail] ---
According to another bug report MAX_PATH has a value of 260. I think it's hard
coded like that all over the place.

Even adding if condition check would help here. The question is that where to
start looking the source code?

[Bug 39988] winepath -w wrong output with path longer 260

https://bugs.winehq.org/show_bug.cgi?id=39988

--- Comment #3 from [e-mail] ---
Maybe wine should allocate everytime a new buffer when a / mark is used for a
path name until the whole path is allocated.